The Nisqually tribal fisherman came to public notice in the 1960s and early '70s during what is now known as the Northwest "Fish Wars." Frank was arrested more than 50 times during protests for tribal fishing rights.

His activism and that of others resulted in a landmark court decision in 1974 called the Boldt Decision. A federal judge ruled that 20 Western Washington tribes are entitled to half of the annual fish harvest in their area.

Afterwards, Frank remained a relentless advocate for salmon and the environment. With his silver hair tied in a pony tail, he frequently testified before Congress and at the legislature in Olympia and counted several governors as personal friends.

Frank kept up his environmental advocacy to the end.

"All of us, we have got to do a better job than we have been doing," said Frank in 2012 at the book launch of a biography about himself. "Them treaties are the law of the land, they're a contract between the United States and our tribes. We are going to bring that to the front."

"He defines perseverance," said Trova Heffernan, Frank’s biographer, at that same event."There's not a trace of bitterness anywhere. He carried no anger."

As word of Frank's passing spread, remembrances poured in from near and far. In a statement issued Monday, Washington Governor Jay Inslee recalled that, "Billy never wavered in his conviction and passion. He stressed to me the spiritual and cultural relationship that indigenous people have with salmon."

"His work is the foundation of an enduring legacy that will never be forgotten in Washington state," Inslee said.

"Indian Country has suffered a monumental loss in the passing of Billy Frank, Jr.," wrote Columbia River Intertribal Fish Commission chairman Paul Lumley from Portland. "His impacts knew no boundaries and were often felt from the streams of the Pacific Northwest to the halls of Washington, D.C. Billy was a living icon."

Frank is survived by three children from two marriages: Tobin "Sugar," Tanu and Willie -- and a large extended family. Frank outlived both of his wives.